package com.nowcoder.community.quartz;

import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.service.ElasticsearchService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.RedisKeyUtil;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.RedisTemplate;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class PostScoreRefreshJob implements Job, CommunityConstant {
    private static final Logger logger = LoggerFactory.getLogger(PostScoreRefreshJob.class);
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private DiscussPostService discussPostService;
    @Autowired
    private LikeService likeService;
    @Autowired
    private ElasticsearchService elasticsearchService;
    private static final Date epoch;
    static {
        try {
            epoch = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2014-08-01 00:00:00");
        } catch (ParseException e) {
            throw new RuntimeException("初始化牛客纪元失败", e);
        }
    }


    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        String redisKey = RedisKeyUtil.getPostScoreKey();
        BoundSetOperations operations = redisTemplate.boundSetOps(redisKey);
        if(operations.size()==0){
            logger.info("[任务取消]没有刷新的帖子");
            return;
        }
        logger.info("[任务开始]正在刷新帖子");
        while(operations.size()>0){
            this.refresh((Integer)operations.pop());
        }
        logger.info("[任务结束]帖子刷新完毕");
    }

    private void refresh(int postId){
        DiscussPost post = discussPostService.findDiscussPostById(postId);
        if(post == null){
            logger.error("[任务失败]帖子不存在, id = " + postId);
            return;
        }
        //是否加精
        boolean wonderful = post.getStatus() == 1;
        //评论数量
        int commentCount = post.getCommentCount();
        //点赞数量
        long likeCount = likeService.findEntityLikeCount(ENTITY_TYPE_POST, postId);

        //计算权重
        double w = (wonderful ? 75 : 0) + commentCount * 10 + likeCount * 2;
        //分数 = 帖子权重 + 距离天数
        double score = Math.log10(Math.max(w, 1)) +
                (post.getCreateTime().getTime() - epoch.getTime())/(1000 * 3600 * 24);
        //  更新帖子分数
        discussPostService.updateScore(postId, score);
        //  同步搜索数据
        post.setScore(score);
        elasticsearchService.saveDiscussPost(post);

    }
}

